NAME
    Env::C - Get/Set/Unset Environment Variables on the C level

SYNOPSIS
      use Env::C;
  
      my $key = "USER";
      $val = Env::C::getenv($key) || '';

      Env::C::setenv($key, "foobar", [$override]);
      $new_val = Env::C::getenv($key) || '';

      Env::C::unsetenv($key);

      my $ar_env = Env::C::getallenv();
      print join "\n", @$ar_env;

DESCRIPTION
    This module provides a Perl API for getenv(3), setenv(3) and
    unsetenv(3). It also can return all the "environ" variables.

    Sometimes Perl invokes modules with underlaying C APIs which rely on
    certain environment variables to be set, if these variables are set in
    Perl and the glue code doesn't worry to set them on the C level, these
    variables might not be seen by the C level. This module shows what
    really the C level sees.

  FUNCTIONS

    * getenv()
          $val = Env::C::getenv($key);

        Returns the value of the environment variable matching the key or
        "undef".

    * setenv()
          Env::C::setenv($key, $value, [$override]);

        The setenv() function adds the variable "$key" to the environment
        with the value "$value", if "$key" does not already exist. If "$key"
        does exist in the environment, then its value is changed to "$value"
        if "$overwrite" is non-zero; if "$overwrite" is zero or is not
        passed, then the value of "$key" is not changed.

    * unsetenv()
          Env::C::unsetenv($key);

        The unsetenv() function deletes the variable "$key" from the
        environment.

    * getallenv()
          my $ar_env = Env::C::getallenv();
          print join "\n", @$ar_env;

        The getallenv() function returns an array reference which includes
        all the all the environment variables.

  EXPORT

    None.

AUTHOR
    Stas Bekman <stas@stason.org>

SEE ALSO
    the perl manpage.